<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <!-- 事件委托 -->
     <div @mouseleave="leaveIndex" @mouseenter="enterShow">
      <h2 class="all">全部商品分类</h2>
      <div class="sort" v-show="show">
        <div class="all-sort-list2" @click="goSearch">
          <!-- 一级分类 -->
          <div class="item" v-for="(c1,index) in categoryList" :key="c1.categoryId" :class="{cur:currentIndex===index}">
            <h3 @mouseenter="changeIndex(index)">
              <a :data-categoryName="c1.categoryName" :data-category1Id="c1.categoryId">{{c1.categoryName}}</a>
            </h3>
            <!-- 二级，三级分类 -->
            <div class="item-list clearfix" v-show="currentIndex==index">
              <div class="subitem" v-for="c2 in c1.categoryChild" :key="c2.categoryId">
                <dl class="fore">
                  <dt>
                    <a :data-categoryName="c2.categoryName" :data-category2Id="c2.categoryId">{{c2.categoryName}}</a>
                  </dt>
                  <dd>
                    <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                      <a :data-categoryName="c3.categoryName" :data-category3Id="c3.categoryId">{{c3.categoryName}}</a>
                    </em>
                   
                  </dd>
                </dl>
              </div>
            </div>
          </div>
        </div>
      </div>
     </div>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
      
    </div>
  </div>
</template>

<script>
// 引入方式：把lodash函数引入
import {throttle} from 'lodash';
import {mapState} from 'vuex'
export default {
    name:'TypeNav',
    data(){
      return {
        // 存储用户鼠标移上哪一个一级分类
        currentIndex:null,
        // TypeNav的显示与隐藏
        show:true
      }
    },
    // 组件挂载完毕，可以向服务器发送请求
    mounted(){
      if(this.$route.name !='home'){
            this.show=false
          }
    },
    // 计算属性
    computed:{
      ...mapState('home',['categoryList'])
      
    },
    // 方法
    methods:{
      // 鼠标进入修改响应式数据currentIndex属性
      changeIndex:throttle(function(index){
        this.currentIndex=index
        // console.log(this.currentIndex);
      },50),
      // 鼠标移除时currIndex属性
      leaveIndex(){
        this.currentIndex=null
        if(this.$route.name !='home'){
            this.show=false
            // this.currentIndex=null
          }
      },
      // 路由跳转，search
      // 用编程式+事件委托
      goSearch(e){
        // nodeName 标签a
        let nodeName = e.target;
        // 商品的id
        let {categoryname,category1id,category2id,category3id}=e.target.dataset
        if(nodeName){
          let location = {name:'Search'} //要跳转到search模块
          let query = {categoryName:categoryname} // 将标签a赋值给categoryName
          console.log(query);
          if(category1id){
            query.category1Id=category1id
          }else if(category2id){
            query.category2Id=category2id
          }else{
            query.category3Id=category3id
          }
        //  如果有params参数也带过去
          if(this.$route.params){
            location.params=this.$route.params
            location.query= query
            this.$router.push(location)
          }
         
        }
      },
      // search模块鼠标进入时显示
      enterShow(){
            this.show=true
      }
    }

};
</script>

<style lang="less" scoped>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      animation: sort .5s linear;
      .all-sort-list2 {
        .item {
          h3 {
            line-height: 27px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            // display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          // &:hover {
          //   .item-list {
          //     display: block;
          //   }
          // }
        }
        .cur{
          background-color: skyblue;
        }
      }
    }
    @keyframes sort {
      from{
        height: 0px;
      }
      to{
        height:461px;
      }
    }
  }
}
</style>>

</style>